Seeking Insights from Recruiters: What’s the Current Situation?

As someone navigating the job application process in the UK, I’m looking for some insights from recruiters.

Earlier this month, I applied for a position on LinkedIn that aligns well with my qualifications. I also reached out to the hiring manager, and after a productive exchange, he indicated that I would be a strong candidate and promised to include me in the interview pool.

However, now that it’s been about 3-4 weeks with no updates on the interview front—and the job has been reposted—I’m wondering about my chances. Does this mean I was considered a good candidate but just not quite what they were looking for? Do recruiters typically aim to have a set number of candidates in the interview pool before they start the process?

Additionally, when would be an appropriate time to send a follow-up message without being bothersome? I appreciate any insights you can provide!